最近一个师兄要求做一个蓝牙通讯功能的微信小程序,记载如下
参考CSDN范例
微信官方的蓝牙API文档
实现功能:
- 对方设备向手机暴露蓝牙
- 微信小程序打开蓝牙搜索设备
- 当得到设备的相应信息后，主动发起连接
- 通过小程序设置相应信息，将修改的结果显示数据到设备上
1、测试是否能搜索到蓝牙设备
index.wxml
蓝牙初始化:
{{isbluetoothready?"ok":"尚未初始化"}}
设备名称:{{item.deviceId}}
设备名称:{{item.deviceId}}
index.wcss
/**index.wxss**/
view {
display: inline-block;
}
.container {
padding: 0;
margin: 0;
align-items: flex-start;
}
.section {
display: inline-block;
width: 100%;
position: relative;
}
.content {
margin: auto;
padding: auto;
position: absolute;
top: 5px;
left: 10px;
}
.switch {
position: relative;
float: right;
right: 0px;
}
button {
background: red\;
}
.list-item {
margin-top: 20rpx;
margin-bottom: 20rpx;
display: flex;
flex-direction: column;
box-sizing: border-box;
border: 1px dashed #000;
}
.list-item text {
margin-top: 10rpx;
}
.list-item button {
margin-right: 10rpx;
}
蓝牙开发注意事项:
微信小程序蓝牙的开发是指基于蓝牙4.0的低功耗蓝牙开发。
通常对蓝牙涉猎不深的人来看将BLE等同于蓝牙4.0，其实不然。蓝牙4.0协议包含BLE，BLE隶属于蓝牙4.0协议的一部分
蓝牙4.0是协议，4.0是协议版本号，蓝牙4.0是2010年6月由SIG（Special Interest Group）发布的蓝牙标准，它有两种模式：
- 1、BLE（Bluetooth low energy）只能与4.0协议设备通信，适应节能且仅收发少量数据的设备（如手环、智能体温计），称之为低功耗蓝牙；
- 2、BR/EDR（Basic Rate / Enhanced Data Rate），向下兼容（能与3.0/2.1/2.0通信），适应收发数据较多的设备（如耳机、手机、平板）。这个模式常常也有人称之为“传统蓝牙”或“经典蓝牙”；
编写JS思路
- 通过wx.openBluetoothAdapter初始化蓝牙设备。
- 通过wx.onBluetoothAdapterStateChange蓝牙适配器状态变化事件
- 通过wx.onBluetoothDeviceFound搜索回调事件可以得到搜索到的蓝牙设备，如果是小米手环一代（设备名：MI1A），则进行记录该设备信息。
index.js
var app = getApp()
var temp = []
var serviceId = "00002A00-0000-1000-8000-00805F9B34FB"
var characteristicId = "00002A00-0000-1000-8000-00805F9B34FB"
Page({
data: {
isbluetoothready: false,
defaultSize: 'default',
primarySize: 'default',
warnSize: 'default',
disabled: false,
plain: false,
loading: false,
searchingstatus: false,
receivedata: '',
onreceiving: false
},
onLoad: function () {
// var str = "A13";
// // var code = str.charCodeAt();
// console.log(str.length)
// console.log(str.charAt(0))
// wx.showToast({
// title: '连接成功',
// icon: 'success',
// duration: 2000
// })
// let buffer = new ArrayBuffer(16)
// let dataView = new DataView(buffer)
// dataView.setUint8(1, 6)
//console.log(dataView.getUint8(1))
},
switchBlueTooth: function () {
var that = this
that.setData({
isbluetoothready: !that.data.isbluetoothready,
})
if (that.data.isbluetoothready) {
wx.openBluetoothAdapter({
success: function (res) {
console.log("初始化蓝牙适配器成功")
wx.onBluetoothAdapterStateChange(function (res) {
console.log("蓝牙适配器状态变化", res)
that.setData({
isbluetoothready: res.available,
searchingstatus: res.discovering
})
})
wx.onBluetoothDeviceFound(function (devices) {
console.log(devices)
temp.push(devices)
that.setData({
devices: temp
})
console.log('发现新蓝牙设备')
console.log('设备id' + devices.deviceId)
console.log('设备name' + devices.name)
}),
fail: function (res) {
console.log("初始化蓝牙适配器失败")
wx.showModal({
title: '提示',
content: '请检查手机蓝牙是否打开',
success: function (res) {
that.setData({
isbluetoothready: false,
searchingstatus: false
})
}
})
}
})
} else {
temp = []
//先关闭设备连接
wx.closeBLEConnection({
deviceId: that.data.connectedDeviceId,
complete: function (res) {
console.log(res)
that.setData({
deviceconnected: false,
connectedDeviceId: ""
})
}
})
wx.closeBluetoothAdapter({
success: function (res) {
console.log(res)
that.setData({
isbluetoothready: false,
deviceconnected: false,
devices: [],
searchingstatus: false,
receivedata: ''
})
},
fail: function (res) {
wx.showModal({
title: '提示',
content: '请检查手机蓝牙是否打开',
success: function (res) {
that.setData({
isbluetoothready: false
})
}
})
}
})
}
},
searchbluetooth: function () {
temp = []
var that = this
if (!that.data.searchingstatus) {
var that = this
wx.startBluetoothDevicesDiscovery({
success: function (res) {
console.log("开始搜索附近蓝牙设备")
console.log(res)
that.setData({
searchingstatus: !that.data.searchingstatus
})
}
})
} else {
wx.stopBluetoothDevicesDiscovery({
success: function (res) {
console.log("停止蓝牙搜索")
console.log(res)
}
})
}
},
connectTO: function (e) {
var that = this
if (that.data.deviceconnected) {
wx.notifyBLECharacteristicValueChanged({
state: false, // 停用notify 功能
deviceId: that.data.connectedDeviceId,
serviceId: serviceId,
characteristicId: characteristicId,
success: function (res) {
console.log("停用notify 功能")
}
})
wx.closeBLEConnection({
deviceId: e.currentTarget.id,
complete: function (res) {
console.log("断开设备")
console.log(res)
that.setData({
deviceconnected: false,
connectedDeviceId: "",
receivedata: ""
})
}
})
} else {
wx.showLoading({
title: '连接蓝牙设备中...',
})
wx.createBLEConnection({
deviceId: e.currentTarget.id,
success: function (res) {
wx.hideLoading()
wx.showToast({
title: '连接成功',
icon: 'success',
duration: 1000
})
console.log("连接设备成功")
console.log(res)
that.setData({
deviceconnected: true,
connectedDeviceId: e.currentTarget.id
})
wx.notifyBLECharacteristicValueChanged({
state: true, // 启用 notify 功能
deviceId: that.data.connectedDeviceId,
serviceId: serviceId,
characteristicId: characteristicId,
success: function (res) {
console.log("启用notify")
}
})
},
fail: function (res) {
wx.hideLoading()
wx.showToast({
title: '连接设备失败',
icon: 'success',
duration: 1000
})
console.log("连接设备失败")
console.log(res)
that.setData({
connected: false
})
}
})
wx.stopBluetoothDevicesDiscovery({
success: function (res) {
console.log("停止蓝牙搜索")
console.log(res)
}
})
}
},
formSubmit: function (e) {
console.log('form发生了submit事件，携带数据为：', e.detail.value.senddata)
var senddata = e.detail.value.senddata;
var that = this
let buffer = new ArrayBuffer(senddata.length)
let dataView = new DataView(buffer)
for (var i = 0; i < senddata.length; i++) {
dataView.setUint8(i, senddata.charAt(i).charCodeAt())
}
wx.writeBLECharacteristicValue({
deviceId: that.data.connectedDeviceId,
serviceId: serviceId,
characteristicId: characteristicId,
value: buffer,
success: function (res) {
console.log(res)
console.log('writeBLECharacteristicValue success', res.errMsg)
}
})
},
formReset: function () {
console.log('form发生了reset事件')
}
})
function getNowFormatDate() {
var date = new Date();
var seperator1 = "-";
var seperator2 = ":";
var month = date.getMonth() + 1;
var strDate = date.getDate();
if (month >= 1 && month <= 9) {
month = "0" + month;
}
if (strDate >= 0 && strDate <= 9) {
strDate = "0" + strDate;
}
var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
+ " " + date.getHours() + seperator2 + date.getMinutes()
+ seperator2 + date.getSeconds();
return currentdate;
}
console output
OneTest.png
查询文档回调方法wx.onBluetoothDeviceFound与wx.getBluetoothDevices
尝试使用getBluetoothDevices获取所有已发现的蓝牙设备，包括已经和本机处于连接状态的设备fgdfgdf